.login-container{
    width: 100%;
    height: calc(100% - 50px);
    /* 让里面的子元素垂直水平居中，需要用flex */
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-dialog{
    width: 350px;
    height: 300px;
    background-color: rgba(234, 224, 224, 0.5);
    border-radius: 10px;
}
.login-dialog h3{
    text-align: center;
    font-size: 25px;
    font-weight: 700;
    padding: 30px 0;
    color: rgb(48, 48, 44);
}
.login-dialog .row{
    width: 100%;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.login-dialog .row span{
    display: block;
    width: 100px;
    font-weight: 700;
    font-size: 20px;
}
#username, #password{
    width: 200px;
    height: 40px;
    font-size: 30px;
    line-height: 40px;
    padding-left: 10px;
    border-radius: 10px;
    /* 去掉边框、轮廓线 */
    border: none;
    outline: none;
}
.row button{
    width: 300px;
    height: 40px;
    font-size: 20px;
    line-height: 40px;
    padding-left: 10px;
    border-radius: 10px;
    /* 去掉边框、轮廓线 */
    border: none;
    outline: none;
    background-color: beige;
    margin-top: 10px;
}
.row button:active{
    background-color: yellowgreen;
}
